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Contact Dermatitis What it is: Basically, this is an allergy-induced rash. Poison ivy falls under this category, but allergies from cosmetics fall under this as well. Common triggers: neomycin in Neosporin and preservatives in makeup and fragrance.

How to treat it: "Treatment is with steroids -- topical if the reaction is mild, injectable and/or oral if it is severe (eyes swollen, etc.)," Waldorf says. To prevent future reactions, figure out what you are allergic to and avoid it. If you're having trouble, a dermatologist or allergist can help you get to the bottom of your reaction with contact patch testing.